If you didn't see last week's opening episode, this is a bit like Top Gear but with a load of awkward looking students in the audience instead of awkward looking petrol heads. Last week's highlights included Dara necking a shot of rather strong vodka before (shoehorned) Ed Byrne announced he was closely related to neanderthals. This week Dara finds out if you can measure the speed of light using cheese on toast, oceanographer Helen Czerski hunts down Albert Einstein's elusive gravitational waves, while Marcus Brigstocke attempts to get to grips with dark energy, and all the while we the viewer wonder exactly who this prime time programme with a distinctly 90s feel (although Ed Byrne's presence last week could be partly to blame for that) is aimed at.